Grinding and polishing machine.



C. J. BARRY.

GRINDING AND POLISHING MACHINE.

APPLICATION FILED APR. 18. l9l].

Patented Feb. 19, 1918.

IN V EN TOR.

WITNESSES. W

m m a m E In J A e m aw CORNELIUS J. BARRY, OF CHICAGO, ILLINOIS, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, OF TWO-THIRDS T0 FREDERICK J. SETC HELL, OF CHICAGO,

ILLINOIS.

GRINDING AND POLISHING MACHINE.

Specification of Letters Patent.

- Application filed April 18, 1917. Serial No. 163,026.

To all whom it may concern:

Be it known'that I, CORNELIUS J. BARRY, a citizen of the United States,'and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Grinding and Polishing Machines; and I do herebydeclare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawlngs,

' tubes or other like articles engaged therein for a grinding, polishing, or bufling operation on the exterior thereof. 5

It is also an object of this invention to construct a machine embracing an adjustable receiving means to receive a tube engaged thereover adjacent to the periphery of a grinding or polishing wheel, and with another movable grinding or polishing wheel actuated through a foot pedal mechanism by the operator toward the tube whereby the tube is 'moved into position between and in contact with the grinding or polishing heels while operated upon.

It is furthermore an important object of this invention to construct a grinding or polishing machine embracing a power driven adjustable stationary polishing or grinding wheel and a slidably mounted grinding or polishing power driven wheel which is movable to and from said first mentioned wheel by a foot pedal mechanism for actuation by an operator, and with adjustable means to receive an article to be operated upon for disposal between said wheels, whereby the operator may cause said wheels to operate upon the work with any degree of pressureand for any length of time whatsoever. Other and furtherimportant objects of the invention will be evident from the disclosure in the drawings and specification. The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

' On the drawings:

Figure 1 is a front elevation partly brokenaway shown in section, of a machine embodying the principles of my invention.

Fig. 2 is a sectional detail on line 22 of Fig. 1.

Fig. 3 is a detail sectional view with parts in elevation on line 33 of Fig. 1.

Fig. 4: is a diagrammaticenlargcd detail view showing the adjustability of one of the grinding wheels with reference to the work and to the other grinding wheel of the machine.

As shown on the drawings:

The reference numeral 1, indicates a base having a table top 2, with the front and rear edges of said table top beveled outwardly, forming guides 3, as clearly shown in Figs. 1 and 3. Mounted adjustably, but in stationary relation upon said table top, is a bearing block 4, the front and rear ends of are provided with set screws 5, whereby the Patented Feb. 19, 1918. I

bearing block may be fixed in any adjusted position upon the. base. J ournaled through the bearings in the bearing block 4, is a shaft 6, with a convex belt pulley 7 secured centrally thereon and with a grinding, polishing or bufling wheel of any preferred material for the particular use desired, secured upon the forward end of said shaft. Also engaged upon the guides 3, is another bearing block 9, which is slidable across the table top 2, toward or away from the bearing block 4. ,Journaled in the bearing block 9, is a shaft 10, provided at its central portion with a convex belt pulley 11, and on the forward end with a grinding or polishing wheel 12, which may be of the same or difl'erent'material from the wheel 8, hereinbefore mentioned.

Secured upon the bearing block 9, is an eye-bracket 13, and pivotally connected thereto are a pair of links 14, which are in turn to'ggled to, another pair of links 15, which are pivoted at their outer ends upon a pair of long arms 16, secured to and extending outwardly from the table top 2, of the base. Connected at the pivot connection of the respective toggled links 14 and 15, and

lever 17, is a connecting rod 18, which, at its lower end, is attachedto a pivoted foot pedal 19,- disposed conveniently upon the floor or other supporting surface for the entire machine. A tension spring 20, is connected on the-under side of the table top 2, of the base, and to the lower curved portion of the lever 17, to resist downward movement thereof by actuation of said pedal 19.

Adjustably mounted upon the top surface of the table 2, of the machine, and,disposed between the respective bearing blocks 4 and 9, is a long flat bar 21, the rear end of which is turned upwardly, as denoted by the reference numeral 22.. Said .bar is provided with a slot 23, through which a clamping bolt 24, engages into the table top 2, of the base of the machine to thereby hold said bar in any adjusted position.- This connection of the bar to the base of the machine permits the bar to be adjusted forwardly and rearwardly, as" well as angularly about the bolt 24.

Rigidly secured in substantially horizontal position in the upturned portion 22, of said bar, is a centralizing or supporting rod 25, for the stock, and said rod extends between the respective polishing or grinding wheels 8 and 12, substantially in line with the centers of each thereof. Trained about the driving pulley 7, for the wheel 8, is a belt 26, and similarly trained about the driving pulley 11, for the wheel 12, is another belt 27, whereby said respective wheels 8 and 12, are driven independently of one another.

The operation is as follows:

The stock to be operated upon is first engaged over the horizontal rod 25, and the operator standing in front of the machine may move the stock longitudinally on said rod to bring any and all desired portions thereof into the held of operation of the respective grinding or polishing wheels 8 and 12. Ordinarily, the tube or rod, being of greater interior diameter than the diameter of the guide or supporting rod 25, fits loosely thereover so that the tube may be engaged upon the rod out of contact with the grinding wheel 8. After the tube is engaged upon the rod 25, the operator depresses the pedal 19,, thereby operating the toggle links 14 and 15, against the stress of the spring 20, to slide the bearing block 9, inwardly, bringing the polishing or grinding wheel 12, into contacting relation with the stock 28, and forcing the same overand against the grinding or polishing wheel 8. The stock is thus prac tically supported between the inding wheels, which may serve to space t at portion of the stock away from its centralizing or supporting rod 25. The pressure upon the pedal 19, determines the grinding pressure upon the stock, and when pressure upon the pedal 19, is released, the spring 20, op-

erates to move the toggle links 14 and 15, to

withdraw the grinding or polishing wheel 25, for different sizes of stock operated upon.

Of course, the adjustability of the supporting or centralizing rod 25, permits proper disposal of the work according to the operations desired to be performed. Obviously,

the grinding or polishing wheels 8 and 12,

may be replaced by other wheels of different material or of different diameter and thickness. Owing to the adjustability of both of the bearing blocks on which the polishing wheels are mounted, a pair of wheels may be continuously used until almost entirely worn away.

I am aware that various details of con struction may .be varied througha wide a range without departing from the principles of this invention, and I therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

1. In a machine of the class describeda base, a bearing block adjustable on said base adapted to be rigidly secured thereto, a slidable bearing block on said base, grinding wheels carried by said blocks, a slotted bar having an upturned end, means engaging through the slot in the bar adjustably at-' taching the bar to the base, a rod secured to the upturned end of the bar extending between the grinding wheels, a pair of arms rigidly secured to the base, toggle levers connected to said arm and to said slidable bearing block, alever pivoted to the toggle arms,

a spring connecting the lever and base and a foot pedal connected to the lever.

2; A grinding and polishing machine comprisinga stationary polishing wheel, an adjustable polishing wheel, an adjustable bar, a rod'secured thereto extending between the polishing wheels, toggle levers to shift the adjustable polishing wheel toward the stationary polishing wheel and a spring for automatically adjusting the adjustable polishing-wheel from the stationary polishing wheel.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses. I

CORNELIUS J. BARRY.

. Witnesses:

CHARLES W. HILLs, Jr., EARL M. HARDINE. 

